Update msrv version to 1.65 in docs

[lalitb]

Changes

While we bumped msrv to 1.65 in #1318, the docs are still showing 1.64. Updating it.
Not updating changelog, as this is just the doc update.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.6%. Comparing base (348ec9e) to head (eaced7f).
Report is 34 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1770     +/-   ##
=======================================
+ Coverage   71.0%   71.6%   +0.5%     
=======================================
  Files        135     136      +1     
  Lines      20751   20846     +95     
=======================================
+ Hits       14746   14935    +189     
+ Misses      6005    5911     -94     

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[cijothomas]

Thanks. Maybe we should find a way to store it in one place only and have it referred elsewhere.

[lalitb]

Thanks. Maybe we should find a way to store it in one place only and have it referred elsewhere.

Yes, same thoughts. Will do it next time :)